GARY McDonald and Lewis Alessandra, both players at Oldham when Tommy Wright was assistant manager there, scored either side of half-time to end the caretaker manager’s unbeaten record.
Both Morecambe goals came from excellent left-wing crosses from Richard Brodie, the architect of the Shrimps first home win of the season.
Wright brought in Danny Whitaker for Jack Lester with the recalled man playing in a very fluid formation that saw Drew Talbot alongside Craig Westcarr in attack, though Whitaker regularly joined in up top.
The Shrimps had former Spireite Barry Roche in goal but Jordan Burrow, released by Chesterfield at the end of 2011, was only a sub, though he got 10 minutes pitch time, almost teeing up Brodie for a late third and then getting a card for a foul on Neal Trotman.
The first half all but passed by with Chesterfield by far the more comfortable of the two sides but without the degree of penetration expected. Trotman headed wide from a Westcarr corner, Drew Talbot drew a save from Roche and Westcarr saw Chris McCready block incredibly well.
Five minutes before the break Westcarr took advantage of a Robbie Threlfall slip but he saw Roche save and from the second phase, Whitaker saw McCready again put his body on the line to block.
Just as the second minute of stoppage time began, Brodie, seemingly blocked in by the left wing corner flag, thumped the ball into the box for McDonald to slide home with more ankle than aplomb for a goal that few saw coming.
Seven minutes after the restart, Morecambe doubled their advantage when Brodie again delivered and Alessandra volleyed in style from close range, a goal that led to the rest of the game being totally controlled by the home side.
Chesterfield, so comfortable before the opener, had no answers after the second goal with a well under par showing, indeed it was the team’s worst spell of the season, even the late introduction of Jack Lester couldn’t conjure up any magic.
Morecambe: 4-4-2: Roche 6, Fenton 7, McCready 7, Drummond 6, Threlfall 6 (Haining 59, 6), Fleming 6, McDonald 6, Wright 7, Redshaw 6 (Burrow 80), Alessandro 7, Brodie 8. Subs (not used): Arestidou, Reid, McGee, Mwasile, Short.
Goal: McDonald 45+2
Chesterfield: 4-5-1: O’Donnell 6, Forbes 5, Hird 7, Trotman 7, Ridehalgh 7, Darikwa 7, Togwell 6, Whitaker 5 (Allott 61, 6), Atkinson 5 (Evans 61, 5), Talbot 6, Westcarr 6 (Lester 78). Subs (not used): Wilson, Clay, Boden, Hazel.
Referee: Andy Haines (Sunderland)